I order the boot at the last minute, as I was going to the Delaware Bayshore to participate in a resue effort for horseshoe crabs and didn't have anything appropriate. They came in two days, tried them on and wore them the rest of the day. There was virtually no need for break-in as they were comfortable right away. Wore them for the event. They were fine for driving, and I was able to walk over rocks, through sea grasses, over sand and through slippery mud with no problem. Waded into the water and my feet remained dry. I tend to be a bit clumsy, but at no point over all the uneven terrain did I even feel the slightest unbalanced. On the basis of this trial run, I would heartily recommend these shoes.